Make ChainMap's new_child() and parents return subclass (#5922)

Jackenmen · web-flow · commit e415a7fad8c9 · 2021-08-13T19:30:48.000+02:00
diff --git a/stdlib/collections/__init__.pyi b/stdlib/collections/__init__.pyi
@@ -286,9 +286,9 @@ class defaultdict(Dict[_KT, _VT], Generic[_KT, _VT]):
 class ChainMap(MutableMapping[_KT, _VT], Generic[_KT, _VT]):
     maps: list[Mapping[_KT, _VT]]
     def __init__(self, *maps: Mapping[_KT, _VT]) -> None: ...
-    def new_child(self, m: Mapping[_KT, _VT] | None = ...) -> ChainMap[_KT, _VT]: ...
+    def new_child(self: Self, m: Mapping[_KT, _VT] | None = ...) -> Self: ...
     @property
-    def parents(self) -> ChainMap[_KT, _VT]: ...
+    def parents(self: Self) -> Self: ...
     def __setitem__(self, k: _KT, v: _VT) -> None: ...
     def __delitem__(self, v: _KT) -> None: ...
     def __getitem__(self, k: _KT) -> _VT: ...
